| Abbreviation | Definition |
|---|---|
| QCT | Quality Carbide Tool |
| QCT | Quartz Crystal Technology |
| QCV | Qatar Cable Vision |
| QCW | Queen City Wheels |
| QD | QuaDelta |
| QD | Quality Data Corporation |
| QD | Quick Detailer |
| QDC | Qatar Distribution Company |
| QDC | Quality Data Corporation |
| QDC | Quantum Dot Corporation |
| QDC | Quonset Development Corporation |
| QDCI | Quest Development Construction Inc |
| QDCI | Quest Development & Construction Inc |
| QDF | Quantocks Directory for Fitness |
| QDG | Quality Design Group |
| QDG | QuarterDeck Games |
| QDG | Quest Development Group, Inc. |
| QDG | Quinlan Design Group |
| QDI | Quality Degree Inc |
| QDI | Quality Designs for Instruction |